Subtract 18/16 from 9/20
1st number: 9/20, 2nd number: 1 2/16
9/20 - 18/16 is -27/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 16 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
9/20 = 9 × 4/20 × 4 = 36/80 - Likewise, for the 2nd fraction, since 16 × 5 = 80,
18/16 = 18 × 5/16 × 5 = 90/80 - Subtract the two like fractions:
36/80 - 90/80 = 36 - 90/80 = -54/80 - After reducing the fraction, the answer is -27/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-18/16 9/20-36/16 9/40-18/16 9/20-18/32 27/20-18/16 9/20-54/16 9/60-18/16 9/20-18/48 45/20-18/16 9/20-90/16 9/20-18/80 63/20-18/16